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Metridiidae
Metridium senile
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Hexacorallia
Order:	Actiniaria
Superfamily:	Metridioidea
Family:	Metridiidae Carlgren, 1893

Metridiidae is a family of sea anemones in the order Actiniaria.

Characteristics

Members of the family Metridiidae are characterised by having a mesogloeal sphincter muscle and by the mesenterial arrangement, with the mesenteries not being divided into macronemes and microcnemes. The acontia typically have microbasic b-mastigophors and microbasic amastigophors, though the latter are not always present in adults.

Genera

The following genera are recognised by the World Register of Marine Species (WoRMS):

• Metridium Blainville, 1824
• Paraisometridium Zamponi, 1978

Of these, Metridium is the most speciose while Paraisometridium is monotypic.

References

1. ^ Metridiidae Archived 2012-03-31 at the Wayback Machine KU Natural History Museum. Retrieved 2011-08-05.
2. Metridiidae World Register of Marine Species. Retrieved 2011-08-05.
3. "WoRMS - World Register of Marine Species - Metridiidae Carlgren, 1893". www.marinespecies.org. Retrieved 2018-05-14.

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